139397780 has 24 divisors (see below), whose sum is σ = 302830920. Its totient is φ = 53836160.

The previous prime is 139397777. The next prime is 139397789. The reversal of 139397780 is 87793931.

It can be written as a sum of positive squares in 4 ways, for example, as 15476356 + 123921424 = 3934^2 + 11132^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139397789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119591 + ... + 120750.

It is an arithmetic number, because the mean of its divisors is an integer number (12617955).

Almost surely, 2^139397780 is an apocalyptic number.

139397780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139397780 is an abundant number, since it is smaller than the sum of its proper divisors (163433140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

139397780 is a wasteful number, since it uses less digits than its factorization.

139397780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240379 (or 240377 counting only the distinct ones).

The product of its (nonzero) digits is 285768, while the sum is 47.

The square root of 139397780 is about 11806.6837003453. The cubic root of 139397780 is about 518.5038106020.

The spelling of 139397780 in words is "one hundred thirty-nine million, three hundred ninety-seven thousand, seven hundred eighty".